style.css

@import url("https://fonts.googleapis.com/css?family=Oxanium|PT+Mono&display=swap");

* {
  box-sizing: border-box;
}

:root {
  --primary-color: dodgerblue;
  --select-color: dodgerblue;
  --success: rgb(15, 158, 2);
  --danger: rgb(214, 23, 23);
}

body {
  margin: 0;
  font-family: PT Mono, sans-serif;
  overflow: hidden;
  display: flex;
  justify-content: center;
  height: 100vh;
  background: #e8e8e8;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='80' viewBox='0 0 80 80'%3E%3Cg fill='%23161616' fill-opacity='0.1'%3E%3Cpath fill-rule='evenodd' d='M11 0l5 20H6l5-20zm42 31a3 3 0 1 0 0-6 3 3 0 0 0 0 6zM0 72h40v4H0v-4zm0-8h31v4H0v-4zm20-16h20v4H20v-4zM0 56h40v4H0v-4zm63-25a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm10 0a3 3 0 1 0 0-6 3 3 0 0 0 0 6zM53 41a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm10 0a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm10 0a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm-30 0a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm-28-8a5 5 0 0 0-10 0h10zm10 0a5 5 0 0 1-10 0h10zM56 5a5 5 0 0 0-10 0h10zm10 0a5 5 0 0 1-10 0h10zm-3 46a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm10 0a3 3 0 1 0 0-6 3 3 0 0 0 0 6zM21 0l5 20H16l5-20zm43 64v-4h-4v4h-4v4h4v4h4v-4h4v-4h-4zM36 13h4v4h-4v-4zm4 4h4v4h-4v-4zm-4 4h4v4h-4v-4zm8-8h4v4h-4v-4z'/%3E%3C/g%3E%3C/svg%3E");
}

.game-container {
  border: 1px solid black;
  box-shadow: 0 10px 20px -5px rgba(0, 0, 0, 0.5);
  width: 530px;
  height: 750px;
  position: relative;
  background: rgba(255, 255, 255, 0.5);
  user-select: none;
  margin-top: 100px;
}

.header {
  background: var(--primary-color);
  color: white;
  font-family: Oxanium, sans-serif;
  font-size: 24px;
  text-shadow: 1px 2px 2px black;
  letter-spacing: 2px;
  height: 100px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.card {
  margin: 5px auto 10px;
  height: 600px;
}

/* Splash Page -------------------- */
input[type="radio"] {
  opacity: 0;
  width: 100%;
  height: 75px;
  position: relative;
  top: -40px;
  cursor: pointer;
  z-index: 2;
}

.selection-container {
  position: relative;
  top: 65px;
}

.radio-container {
  width: 90%;
  height: 75px;
  margin: 25px;
  cursor: pointer;
  border: 2px solid black;
  border-radius: 5px;
}

label {
  position: relative;
  top: 20px;
  left: 20px;
  font-size: 30px;
}

.selected-label {
  background: var(--select-color);
  color: white;
}

.best-score {
  position: relative;
  top: -100px;
  left: 330px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
  font-size: 18px;
  max-width: fit-content;
}

.best-score span {
  margin: 0;
}

.best-score span:last-child {
  font-size: 24px;
}

.selection-footer {
  top: 134px;
}

/* Game Page -------------------------- */
.height-240 {
  height: 240px;
  width: 100%;
}

.height-500 {
  height: 500px;
  width: 100%;
}

.item-container {
  height: 552px;
  overflow-y: scroll;
  position: relative;
  -ms-overflow-style: none;
}

.item-container::-webkit-scrollbar {
  display: none;
}

.item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  height: 80px;
  margin: 0 50px;
  user-select: none;
}

.finished > h1 {
  opacity: 0.5;
}

.selected-item {
  background: var(--select-color);
  position: fixed;
  top: 443px;
  z-index: -1;
  width: 529px;
  height: 80px;
}

.item-footer,
.selection-footer {
  width: 100%;
  height: 90px;
  background: rgba(0, 0, 0, 1);
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.item-footer {
  top: 1px;
}

button {
  cursor: pointer;
  height: 50px;
  border-radius: 5px;
  font-size: 25px;
  font-family: Oxanium, sans-serif;
  color: white;
  border: none;
  outline: none;
}

button:hover {
  filter: brightness(110%);
}

button:active {
  transform: scale(0.99);
}

.wrong,
.right {
  width: 40%;
}

.wrong {
  background: var(--danger);
  margin-right: 25px;
}

.right {
  background: var(--success);
}

.start,
.play-again {
  width: 90%;
  background: var(--primary-color);
}

/* Countdown Page ---------------------- */
.countdown {
  margin-top: 45%;
  font-size: 100px;
  text-align: center;
  user-select: none;
  cursor: pointer;
}

/* Score Page ------------------------- */
.score-container {
  height: 600px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.score-footer {
  width: 100%;
  height: 90px;
  display: flex;
  justify-content: center;
  position: relative;
  top: -30px;
}

.title {
  font-size: 45px;
}

.final-time {
  font-size: 100px;
  margin: 0;
  color: var(--success);
}

.base-time {
  margin-top: 100px;
  margin-bottom: 0;
}

.penalty-time {
  color: var(--danger);
}

/* Media Query: Laptop */
@media screen and (max-width: 1800px) {
  .game-container {
    margin-top: 35px;
  }

  .selected-item {
    top: 380px;
  }
}

/* Media Query: Large Smartphone (Vertical) */
@media screen and (max-width: 500px) {
  .game-container {
    width: 100%;
    margin-top: 0;
    border: none;
  }

  .selected-item {
    top: 345px;
  }

  .header {
    font-size: 1.2rem;
  }

  .countdown {
    margin-top: 60%;
  }

  .selection-container {
    top: 100px;
  }

  .radio-container {
    width: 93%;
    margin: 15px;
  }

  label {
    font-size: 1.7rem;
  }

  .best-score {
    font-size: 1rem;
    left: 245px;
  }

  .selection-footer {
    top: 183px;
  }
}

/* Media Query: iPhone */
@media screen and (max-width: 376px) {
  .best-score {
    left: 232px;
  }
}